a {
  text-decoration: none;
  /* 去除默认的下划线 */
  outline: none;
  /* 去除旧版浏览器的点击后的外虚线框 */
  color: #000;
}
.main {
  width: 1300px;
  margin: 110px auto;
  height: 75rem;
}
.main ul {
  position: relative;
  margin: 0 auto;
  padding-top: 80px;
  width: 1170px;
  height: 750px;
}
.main ul .topic {
  position: absolute;
  top: -45px;
  left: 400px;
  font-size: 38px;
}
.main ul li {
  width: 1170px;
  height: 148px;
  margin-bottom: 50px;
}
.main ul li a {
  width: 1170px;
  height: 148px;
}
.main ul li a img {
  float: left;
  width: 260px;
  height: 148px;
  border-radius: 6px;
}
.main ul li a div {
  float: left;
  width: 864px;
  height: 148px;
  padding-left: 26px;
  position: relative;
}
.main ul li a div .black {
  display: none;
  position: absolute;
  top: 0;
  left: -26px;
  width: 890px;
  height: 148px;
  background-color: rgba(155, 155, 155, 0.1);
}
.main ul li a div h2 {
  font-weight: 400;
  margin-top: 10px;
  font-size: 16px;
  color: #333;
}
.main ul li a div p {
  margin-top: 10px;
  font-size: 14px;
  line-height: 26px;
  color: #878787;
}
